Li Siyun, Xia Maoting, Xiao Chengxiang, Zhang Xikun, Yu Haoxiang, Zhang Liyuan, Shu Jie
School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China.
Dalton Trans. 2021 May 18;50(19):6520-6527. doi: 10.1039/d1dt00805f.
In order to meet the growing demand of energy storage for the power grid, aqueous NH4+ batteries are attracting increasing attention as a promising alternative due to their environmental significance, abundant resources, and fast diffusion ability. In this work, FeFe(CN)6 (FeHCF) is synthesized as a cathode material for aqueous NH4+ batteries and Fe2(SO4)3 is utilized as a kind of functional additive in the electrolyte based on the "common ion effect" to enhance its electrochemical performance. The results indicate that the initial capacity of FeHCF is about 80 mA h g-1 with a coulombic efficiency of 97.8%. The retention rate can attain 96.3% within nearly 1000 cycles. Multivariate analysis methods are carried out to characterize the mechanism of FeHCF in aqueous NH4+ batteries. From the practical standpoint, FeHCF has outstanding cycling stability and rate capability, making it feasible to be applied in the power grid.
为了满足电网对储能日益增长的需求，水系NH4+电池因其环境意义、资源丰富和扩散能力快等优势，作为一种有前景的替代方案正受到越来越多的关注。在这项工作中，合成了FeFe(CN)6（FeHCF）作为水系NH4+电池的正极材料，并基于“同离子效应”，将Fe2(SO4)3用作电解液中的一种功能添加剂，以提高其电化学性能。结果表明，FeHCF的初始容量约为80 mA h g-1，库仑效率为97.8%。在近1000次循环内，保留率可达到96.3%。采用多元分析方法来表征FeHCF在水系NH4+电池中的作用机理。从实际应用角度来看，FeHCF具有出色的循环稳定性和倍率性能，使其在电网中应用成为可能。
